本帖最后由 swe21 于 2011-12-28 15:07 编辑
用Virtex6的MMCM，MAP的时候出问题了,错误提示如下："physical_group_instance_name/CLKOUT1/instance_name/MMCM_BASE_inst"' has its
target frequency, FVCO, out of range. Valid FVCO range for speed grade "-1"
is 600MHz - 1200MHz. The computed FCVO is a function of the input frequency
CLKIN1_PERIOD, the division factor DIVCLK_DIVIDE, and the CLKFBOUT_MULT_F
attribute (FVCO = 1000*CLKFBOUT_MULT_F/(CLKIN1_PERIOD*DIVCLK_DIVIDE)). The
CLKIN_PERIOD attribute may have been set by ngdbuild based on the user
specified PERIOD constraint. The current calculated FVCO is INFINITE because
CLKIN1_PERIOD is 0. To resolve this error, either the attribute should be
changed to a non-zero value, or CLKIN1 input should be disconnected.
Reference the V6 architecture Users Guide or search the Xilinx Answer Records
database for the error code.
输入是50Mhz，用coregen也提示同样的错误啊
新手哈，望大哥们帮看一下啊 |
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